2017MNRAS.467.3944G

Query : 2017MNRAS.467.3944G

2017MNRAS.467.3944G - Mon. Not. R. Astron. Soc., 467, 3944-3950 (2017/June-1)

Testing atomic collision theory with the two-photon continuum of astrophysical nebulae.

GUZMAN F., BADNELL N.R., CHATZIKOS M., VAN HOOF P.A.M., WILLIAMS R.J.R. and FERLAND G.J.

Abstract (from CDS):

Accurate rates for energy-degenerate l-changing collisions are needed to determine cosmological abundances and recombination. There are now several competing theories for the treatment of this process, and it is not possible to test these experimentally. We show that the H I two-photon continuum produced by astrophysical nebulae is strongly affected by l-changing collisions. We perform an analysis of the different underlying atomic processes and simulate the recombination and two-photon spectrum of a nebula containing H and He. We provide an extended set of effective recombination coefficients and updated l-changing 2s - 2p transition rates using several competing theories. In principle, accurate astronomical observations could determine which theory is correct.

Journal keyword(s): atomic data - atomic processes - H ii regions - planetary nebulae: general - cosmic background radiation - cosmology: observations - cosmology: observations

Simbad objects: 1

Full paper

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	PN A66 39	PN	16 27 33.7199223168	+27 54 33.471380376		15.27	15.60			DAO.70	132	0

Query : 2017MNRAS.467.3944G

Basic data :

PN A66 39 -- Planetary Nebula

* (CSI,GEN#,...), PN (PN,PK), WD* (1999A&A,WD), blu (2019A&A), HS? (2019A&A), UV (PG), NIR (2MASS)

16 27 33.7199223168 +27 54 33.471380376 (Optical) [ 0.0282 0.0324 90 ] A 2020yCat.1350....0G

16 25 32.5329014984 +28 01 11.083171995 [ 0.0282 0.0324 90 ]

047.0517434504217 +42.4826283941822 [ 0.0282 0.0324 90 ]

-7.280 -5.597 [0.037 0.044 90] A 2020yCat.1350....0G

0.8499 [0.0422] A 2020yCat.1350....0G

DAO.70 C 2004MNRAS.355.1031G

2.900 2.900 90 (Rad) D 2008ApJ...689..194S

B 15.27 [~] E ~

V 15.60 [~] E ~

G 15.573778 [0.002830] C 2020yCat.1350....0G

J 16.134 [0.102] D 2003yCat.2246....0C

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`PN G047.0+42.4`	`PG 1625+280`	`PN ARO 180`	`Gaia DR2 1305573511415857536`
`CSI+28-16255`	`PK 047+42 1`	`TIC 219745583`	`Gaia DR3 1305573511415857536`
`GEN# +6.20056039`	`PN A55 27`	`UBV 13929`
`GSC2 N13220123587`	`PN VV' 140`	`UBV M 44668`
`2MASS J16273371+2754334`	`PN A66 39`	`WD 1625+280`

References (132 between 1850 and 2026) (Total 132)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : PN A66 39

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`PN G047.0+42.4`	`2MASS J16273371+2754334`	`PG 1625+280`	`WD 1625+280`	`Gaia DR2 1305573511415857536`
`Gaia DR3 1305573511415857536`

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